摘要
试验采用正交设计和溶液培养,比较了N素形态、浓度和溶液pH值对枳和红桔幼苗Fe素营养的影响;分析了叶片叶绿素、总Fe、活性Fe、全N和NO_3^--N含量。结果表明,NO_3^-营养植株失绿黄化而NH_4^+营养植株保持绿色.叶片活性Fe含量与叶绿素含量呈显著正相关,并受N素形态的影响。叶片总Fe含量与叶绿素含量及N素形态均无显著关系。活性Fe含量可较好地反映植株的Fe素营养状况。N素形态、柑桔种类和溶液pH值对活性Fe含量的影响率分别为66.07％、25.93％和1.88％。N浓度对Fe素营养无显著影响。N素形态影响Fe在体内的分布或利用;而不影响Fe的吸收。
An orthogonal design and solution culture were adopted to compare the effects of N forms (NO_3^- and NH_4^+), concentrations (120 and 2+0 ppm) and solution pH (5.5 and 7.5) on the Fc nutrition of two citrus species (Poncirus trifoliata (L.) Raf. and Citrus reticulata Blanco). The contents of chlorophyll, total Fe, active Fe, total N and NO_3^--N in the leaves were determined. The results showed that N forms, citrus species and solution pH had significant influence on the Fe nutrition status of the plants, with the effects of N forms being most important. All the plants supplemented with N-NO_3^- became chlorotic whereas the plants with N—NH_4^+ remained green. The active Fe contents in the leaves showed a significant positive correlation with the chlorophyll contents and varied significantly with the forms of N. Total Fe in the leaves was not correlated with either chlorophyll contents or the forms of N. The effects of N forms, citrus species and solution pH on the active Fe accounted for 66.07, 25.93 and 1.88%, respectively, of the total sum of square in the analysis of variance. N concentrations had little effect on the Fe nutrition of citrus. It was concluded that the forms of N influenced the redistribution and utilization of Fe in the leaves rather than the uptake of Fe from the solution.
出处
《西南农业大学学报（自然科学版）》
CSCD
1991年第5期498-502,共5页
Journal of Southwest Agricultural University
关键词
氮素形态
柑枯类果树
铁素营养
氮浓度
Nitrogen
morphology
citrus reticulata trees
influence / Fenutrition
